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Open AccessComposite topological structures in SO(10)
We explore a variety of composite topological structures that arise from the spontaneous breaking of SO(10) to SU(3)c × U(1)em via one of its maximal subgroups SU(5) × U(1)χ, SU(4)c × SU(2)L × SU(2)R, and SU(5) ×
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Open AccessPrimordial monopoles and strings, inflation, and gravity waves
We consider magnetic monopoles and strings that appear in non-supersymmetric SO(10) and E6 grand unified models paying attention to gauge coupling unification and proton decay in a variety of symmetry breaking sc...
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Article
Open AccessProton decay in supersymmetric SU(4)c × SU(2)L × SU(2)R
We discuss proton decay in a recently proposed model of supersymmetric hybrid inflation based on the gauge symmetry SU(4)c × SU(2)L × SU(2)R. A U(1) R symmetry plays an essential role in realizing inflation as we...
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Article
Open AccessMonopoles, strings, and necklaces in SO(10) and E6
We employ a variety of symmetry breaking patterns in SO(10) and E6 Grand Unified Theories to demonstrate the appearance of topological defects including magnetic monopoles, strings, and necklaces. We show that in...
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Particle Physics Approach to Dark Matter
We review the main proposals of particle physics for the composition of the cold dark matter in the universe. Strong axion contribution to cold dark matter is not favored if the Peccei-Quinn field emerges with...
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Inflationary Cosmology
The big bang model and the history of the early universe according to the grand unified theories are introduced. The shortcomings of big bang are discussed together with their resolution by inflationary cosmol...
